Resolve the remnant nature of GRB 090510

Determine whether the remnant of GRB 090510 is a black hole or a stable magnetar.

Background

The paper notes conflicting interpretations of the remnant produced by GRB 090510. One treatment models it as a black hole, while an interpretation of the X-ray afterglow plateau favors a stable magnetar.

The authors state that their angular-structure inference does not depend on resolving this issue, but identify the remnant’s nature as unsettled.

References

The nature of the remnant of GRB 090510 is itself unsettled: it is a black hole in the treatment adopted by \citet{2026JHEAp..5000464R}, whereas the plateau in its X-ray afterglow has been fitted with a stable magnetar .

— The angular structure of the GW170817 jet from prompt emission alone  (2609.04776 - Moradi et al., 4 Sep 2026) in Supplemental Material, Section “Relation to earlier off-axis treatments”